Allow menus to stay open during a child view's drag and drop

ui/views/controls/menu/menu_controller.h

 // Copyright (c) 2012 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #ifndef UI_VIEWS_CONTROLS_MENU_MENU_CONTROLLER_H_
 #define UI_VIEWS_CONTROLS_MENU_MENU_CONTROLLER_H_
 
 #include "build/build_config.h"
 
 #include <list>
@@ skipping 124 matching lines @@
   bool CanDrop(SubmenuView* source, const ui::OSExchangeData& data);
   void OnDragEntered(SubmenuView* source, const ui::DropTargetEvent& event);
   int OnDragUpdated(SubmenuView* source, const ui::DropTargetEvent& event);
   void OnDragExited(SubmenuView* source);
   int OnPerformDrop(SubmenuView* source, const ui::DropTargetEvent& event);
 
   // Invoked from the scroll buttons of the MenuScrollViewContainer.
   void OnDragEnteredScrollButton(SubmenuView* source, bool is_up);
   void OnDragExitedScrollButton(SubmenuView* source);
 
+  // Called by the Widget when a drag is about to start on a child view. This
+  // could be initiated by one of our MenuItemViews, or could be through another
+  // child View.
+  void OnDragWillStart();
+
+  // Called by the Widget when the drag has completed. |should_close|
+  // corresponds to whether or not the menu should close.
+  void OnDragComplete(bool should_close);
+
   // Update the submenu's selection based on the current mouse location
   void UpdateSubmenuSelection(SubmenuView* source);
 
   // WidgetObserver overrides:
   virtual void OnWidgetDestroying(Widget* widget) OVERRIDE;
 
   // Only used for testing.
   static void TurnOffMenuSelectionHoldForTest();
 
  private:
@@ skipping 449 matching lines @@
   bool item_selected_by_touch_;
 
   scoped_ptr<MenuMessageLoop> message_loop_;
 
   DISALLOW_COPY_AND_ASSIGN(MenuController);
 };
 
 }  // namespace views
 
 #endif  // UI_VIEWS_CONTROLS_MENU_MENU_CONTROLLER_H_